JPH03461A - Apparatus for casting cylinder block - Google Patents

Abstract

PURPOSE:To enable positioning with high accuracy by positioning a cylinder liner, water jacket core and crank case core positioned on a jig with a bore mold and front and back molds, respectively and setting them to a fixed lower mold. CONSTITUTION:In the cylinder liner 54, water jacket core 45 and crank case core 46 positioned on the jig, the cylinder liner with the bore mold 13 and the water jacket core ad crank case core with core print inserting part in the front and back molds 15, 16 are supported under the above positioned condition, respectively. In the molten metal pouring position, by positioning the bore mold and the front and back molds against the fixed lower mold 2, the positionings thereof against the fixed lower mold are executed. Then, by pouring the molten metal after mutually positioning a side mold 4 together with the fixed lower mold, bore mold and the front and back molds, each core is cast and included as internal chill under supported and positioned state to each mold. By this method, the positioning accuracy of the core, etc., is drastically improved and the perfect automation can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a cylinder block casting apparatus, and more specifically, when manufacturing a cylinder block made of aluminum alloy by a low-pressure casting method, cylinder liners, water jacket cores, and crankshafts are used. The present invention relates to a casting device that can automatically position a case core with high precision.

Conventional technology An example of a low-pressure casting device with a function of automatically setting a core in a mold is JP-A-62-179860.
There are some that are disclosed in the publication.

This casting equipment consists of a lower guide base to which the lower mold is attached, a core surface plate where the core is temporarily placed on standby, and a product receiving mechanism that receives the product released from the upper mold in a horizontal direction. A first trolley is provided above the lower die base and the core platen at an appropriate interval, and is reciprocated between the lower die base and the core surface plate. Furthermore, a second carriage is provided above the lower die base and the product receiving mechanism to reciprocate between them, and an upper die base to which the upper mold is attached is mounted on the second carriage so as to be movable up and down.

According to this structure, by alternately operating the first cart and the second cart, everything from positioning the core to the lower mold, mold clamping and pouring, to opening the mold and taking out the product is automatically performed. be able to.

Problem to be Solved by the Invention However, in the above-mentioned low-pressure casting apparatus, after the core gripped by the core gripping mechanism is positioned on the lower mold, the core gripping mechanism releases the core and retreats. Therefore,
Until the lower and upper molds are matched, the core is simply placed on the lower mold and there is nothing to restrain the core. Therefore, conventional equipment can only be used for casting products with core dies with extremely high postural stability; In cases where the core must be positioned in a state where the core is substantially suspended from the lower mold, the core cannot be positioned with high precision.

The present invention was made in view of the above problems.
The present invention provides a cylinder block casting device that can position a cylinder liner, water jacket core, and crankcase core with high precision with respect to a lower mold, and can perform the positioning extremely simply and quickly. be.

Means for Solving the Problems The present invention first provides a cylinder block W as shown in FIG.
A cylinder block is cast in which the lower end of one of the skirt parts S is curved inward in the crankcase C, and the skirt parts S I + S are formed asymmetrically about the plane containing the cylinder bore center line. The premise is that. A cylinder/block having such a shape is used, for example, in the engine of a four-wheel drive vehicle.

The casting apparatus of the present invention includes a fixed lower die fixed to a horizontal lower fixing plate at a pouring position, a pair of horizontal dies provided on the lower fixing plate and movable relative to the fixed lower die, It is installed at a standby position adjacent to the hot water position, and in addition to the cylinder liner and water jacket core, the crankcase core, which corresponds to the above-mentioned curved skirt and forms part of the lower mold, is placed in a regular position. A jig for positioning at the casting position, a traveling carriage that is movable horizontally between the pouring position and the standby position and is equipped with a mold mounting frame that can be raised and lowered, and that is attached to the mold mounting frame. is,
a bore mold that moves up and down relative to the fixed lower mold together with the mold mounting frame; and a fixed lower mold that is attached to the mold mounting frame and is movable horizontally relative to the bore mold.

A front-rear type that forms a product space together with a horizontal type and a bore type, and a front-rear type that is formed into the front-rear type and fits with the baseboard of the water jacket core and crankcase core to form a water jacket core and a crankcase core. a baseboard insertion portion for positioning and supporting the cylinder liner; a suction opening formed on the circumferential surface of the bore mold and connected to a pressure reducing means for adsorbing and positioning and supporting the cylinder liner on the bore mold; A movable positioning member is provided for positioning the water jacket core, and for retracting in a direction to avoid interference with the crankcase core in response to vertical relative displacement between the jig and the mold mounting frame. We are prepared.

Function According to this structure, among the cylinder liner, water jacket core, and crankcase core positioned on the jig, the cylinder liner is of the bore type, and the water jacket core and the crankcase core are of the front and rear type baseboards. After supporting each in the previous positioning state by the insertion part,
By positioning the bore mold and the front and rear molds with respect to the fixed lower mold at the pouring position, the cylinder liner, water jacket core, and crankcase core are positioned with respect to the fixed lower mold.

Then, by adding the horizontal mold to the above-mentioned fixed lower mold and bore mold 1 front and rear molds, and pouring the metal after positioning them mutually, the cylinder litchi, water jacket core, and crankcase core are positioned and supported by each mold. It will be cast and molded.

Note that the term "casting" here refers to something that is once cast in a predetermined position within the cylinder block, regardless of whether or not the part remains as a part of the product after being cast. shall be.

Embodiment FIG. 1 is a perspective view showing an embodiment of the casting apparatus of the present invention, and FIGS. 2 and 3 are a sectional front view and a side view of the main parts thereof.

In the figure, P1 is a pouring station, P is a waiting station adjacent to one side of pouring station P1 (left side in the figure), and P3 is a waiting station adjacent to the other side of pouring station P1 (right side in the figure). Each mold exchange station is shown.

A lower fixing plate 1 is arranged horizontally in the pouring station P1, and a fixed lower mold 2 is fixed to this lower fixing plate i-h. A horizontal mold 4 is provided in the center of the mold 2 and is driven forward and backward from the left and right by the operation of a horizontal cylinder 3, and a molten metal holding furnace 5 is disposed below the lower fixing plate 1.

In addition, each of the stations P1゜P, , P
, a pair of track rails 6 are passed over the track rails 6, and a traveling carriage 7 that runs between the standby station P and the mold exchange station P is provided on the track rails 6.

The traveling trolley 7 is provided with a motor 8 as its traveling drive source, and also supports a mold mounting frame 1O that is driven up and down by an elevating cylinder 9, so that the mold mounting frame 10 can be moved up and down in a plurality of directions with respect to the traveling trolley 7. It is designed to be guided by a guide rod 11. A bore resin 3 integrated with the upper mold 12 is fixed to the center part of the lower surface of the mold mounting frame 10, and a front mold 15 and a rear mold are fixed to the front and rear parts of the lower surface of the mold mounting frame 10, as shown in FIG. Opening/closing cylinders 17 and 18 are respectively attached to move the cylinders 16 horizontally forward and backward with respect to the bore roll 3.

A lifter 19 and a traverse rail 20 are installed at the standby station P adjacent to the left side of the pouring station P1.
These traverse rails 20 extend in the front and rear direction via the standby station P.

Two carts, a core transport cart 21 and a work loading cart 22, are mounted on the traverse rail 20, and a core setting jig 23 is mounted on the core transport cart 21.
On the workpiece loading cart 22, workpiece receivers each position and place jigs 24. Each of these carts 21
．． 22 connects each rotary actuator 25, 26 to the trolley 21, 22 via a crank mechanism 27, 28, respectively.
Based on the operation of 5.26, it is possible to travel from each end of the traverse rail 20 to the standby station P6 position, in other words, to the position directly above the lifter 19.

Here, the lifter 19 is attached to one of the carts 21 or 2.
2 is located directly above it, it operates and the trolley 21
It functions to lift the jig 23 or 24 on the or 22 to a predetermined height by fitting the locating pin 30 of the lifter 19 into the recess 29 provided there.

Furthermore, a running rail 31 extending in the front and back direction is installed at the mold exchange station P3, and this running rail 3
A mold exchange cart 32 is placed on top of the mold exchange cart 32.

The main parts of the casting apparatus as described above will be explained in detail below based on FIGS. 5 and 6.

In FIG. 5, a pouring port 33 provided on the fixed lower mold 2 on the lower fixed plate 1 is connected to the molten metal holding furnace 5 shown in FIGS. 1 and 2 via a feeder 34 and a stalk 35,
A bore mold 13 integrated with the upper mold 12 is attached to the lower surface of the mold mounting frame 10 connected to the lifting cylinder 9 via a bracket 36, and an eject turbine 38 is disposed vertically penetrating the upper mold 12. It is connected via a connecting plate 39 to a product extrusion cylinder 40 attached to the upper surface of the mold mounting frame 10. A suction opening 42 connected to a vacuum pump 41 as suction means is formed on the peripheral surface of the tip of the bore mold 13.

Furthermore, the front and rear molds 15 and 16 are mounted on mold mounting plates 4 provided at each rod end of the opening/closing cylinder 17 and 18, as shown in FIG.
3, and the pair of horizontal molds 4.4 are respectively connected to a mold mounting plate 44 provided at the rod end of the horizontal cylinder 3. And, on the mold surface of the front and rear molds 15 and 16, there is a seventh
A baseboard insertion portion 50 for fitting the ends of the baseboards 47.48.49 of the water jacket core 45 shown in the figure and the crankcase core 46 shown in FIGS. 8 and 9, respectively.
51.52 is formed.

Therefore, by setting the front and rear molds 15 and 16 in the forward posture with respect to the bore mold 13, lowering the bore mold 13 with respect to the fixed lower mold 2, and further moving the horizontal molds 4 and 4 forward with respect to the fixed lower mold 2, A product space (cavity) R of the cylinder block W is defined between the molds.

As shown in FIG. 10, the core setting jig 23 includes a jig body 53 for positioning the crankcase core 46, and a jig body 53 provided on the jig body 53 for positioning the cylinder liner 54 (see FIG. 7). It is composed of a pedestal 55 and positioning blocks 56 and 57, which are also provided on the jig main body 55 and position the water jacket core 45. One positioning block 57 is rotatably hinged to an arm 58 erected on the jig main body 53 via a pin 59, and can be rotated upward from the horizontal state shown in FIG. 10(A). It has become.

Next, the operation of the casting apparatus configured as described above will be explained.

For example, when manufacturing the cylinder block W for an in-line four-cylinder engine shown in FIG. In the state shown in FIG. 3, four cast iron cylinder liners 54 and water jacket cores 45 as shown in FIG. 7 and four cast iron cylinder liners 54 as shown in FIG. Both the crankcase core 46 and the crankcase core 46 are heated to a temperature of about 500° C. and positioned and mounted. In other words, Fig. 2 and Fig. 10 (A)
As shown in FIG. 2, the cylinder liner 54, the water jacket core 45, and the crankcase core 46 are mutually positioned at regular casting positions in the product shape. Next, the core carrier 21 is moved to the standby station P by the operation of the rotary actuator 25, and at this P2 position, the cylinder liner 54. Together with the water jacket core 45 and the crankcase core 46, it is raised by the lifter 19 to its upper limit position shown by the imaginary line in FIG.

At this point, the front and rear molds 15 and 16 attached to the mold mounting frame 10 are in a backward position with respect to the bore mold 13 due to the operation of the lifting cylinder 9, and are waiting at the lowering limit position.

As a result, the bore mold 13 enters into the cylinder liner 54, and is also suctioned from the suction opening 42 by the vacuum pump 4I, thereby moving each cylinder liner 54 into the cylinder liner 54.
Vacuum suction is applied to the circumferential surface of 3.

Here, as shown in FIG. 10, the inner peripheral surface of the cylinder liner 54 has a slope corresponding to the draft angle of the entry portion of the bore mold 13. On the other hand, when the cylinder liner 54 reaches its rising limit, the accuracy of the cylinder liner 54 with respect to the bore mold 13 is determined based on the close contact of the cylinder liner 54 to the circumferential surface of the bore mold 13. Not only is the molten metal properly positioned, but also the molten metal is completely prevented from being inserted between the two.

Furthermore, after waiting for the bore mold 13 and the cylinder liner 54 to be positioned, the front and rear molds 15 are placed against the bore mold 13.
．． By moving the opening/closing cylinders 17 and 16 forward, each of the water jacket core 45 and crankcase core 46 on the core setting jig 23 is moved as shown in FIGS. 6, 7, and 8. Skirting board 47.4
8.49 into the baseboard insertion portions 50, 51.degree. 52 of the front and rear molds 15.16 to accurately position and hold the water jacket core 45 and crankcase core 46. Here, water jacket core 4
By supporting baseboards 47 and 48 at three locations regarding baseboard 5, rotational moment around baseboard 48 is suppressed, making more accurate positioning possible.

In this way, the cylinder liner 54. After the water jacket core 45 and the crankcase core 46 are each positioned and held with high precision by the bore mold 13 and the front and rear molds 15° 16, the core setting jig 23 is lowered by the lifter 19, and then moved to the lifting cylinder. 9, the mold mounting frame 10 is attached to the bore mold 13 and the front and rear molds 15.
．． 16, and also the cylinder liner 54 and each core 45, 46, and the subsequent traveling truck 7.
Based on the travel movement of a predetermined amount, the cylinder liner 54 and each core 45, 46 are accurately positioned at the pouring station P, as shown by solid lines in FIG.

At this time, as shown in FIGS. 10(A), 10(B), and 10(C), in the process of the core setting jig 23 descending, the reference professional 1. 57 interferes with the crankcase core 46 located below the water jacket core 45. However, as shown in (B) and (C) of the same figure, the movable reference block 57 in contact with the crankcase core 46 rotates upward as the core setting jig 23 moves downward. Avoid the above interference by evacuating.

Subsequently, based on the elongation operation of the lifting cylinder 9 again, the bore mold 13 and the front and rear molds 15 and 16 are gradually lowered, and as shown in FIGS. 2 and 5, they are placed in a predetermined position relative to the fixed lower mold 2. By setting accurately, the cylinder liner 54. held by the bore type 13ti5 and the front and rear types 15. Water jacket core 45
And the crankcase core 46 is also very smooth,
In addition, it is set in a predetermined position relative to the fixed lower mold 2 with high precision, and then the horizontal cylinder 3 advances the horizontal mold 4 relative to the fixed lower mold 2, so that each mold is set as shown in FIG. A product space R of the cylinder block having a required three-dimensional shape is formed therebetween. As a result, the crankcase core 46 substantially functions as a part of the fixed lower mold 2.

For this product space R, the molten metal in the molten metal holding furnace 5 is transferred to the stalk 35. Molten metal is poured through the feeder 34 and the pouring port 33. As a result, the cylinder liner 54 and each core 45, 46 are cast.

After the molten metal is completely solidified to form the required cylinder block W, first the horizontal mold 4 is moved back relative to the fixed lower mold 2, and then the upper mold 12 is moved by the lifting cylinder 9. The bore mold 13 and the front and rear molds 15.16 are lifted together with the cylinder block W as shown in FIG.
are transported to a standby station P by a traveling carriage 7, and at that position, the lifting cylinders 9 are extended to bring them to their lowering limit positions.

Next, the waiting station P on the traverse rail 20
At position 7, as shown in FIG. 14, by raising the lifter 19 on which the workpiece loading cart 22 is placed and waiting, the workpiece receiver positioned and arranged on the cart 22 moves the jig 24 in the same figure. The cylinder block W is temporarily received by the jig 24. Furthermore, while the bore mold 13 is moved upward, the front and rear molds 15 and 16 (not shown) are also moved backward, and in this state, the eject turbine 38 is projected from the upper mold 12 by the operation of the product extrusion cylinder 40, so that the cylinder block W is released from the bore mold 13.

In addition, during such mold release, damage to the cylinder block W can be extremely effectively prevented by, for example, synchronizing the ejection speed of the ejector turbine 38 and the descending speed of the work receiver jig 24.

The workpiece receiving jig 24 that has received the cylinder block W in this manner is positioned again on the workpiece loading cart 22 by the lifter 19, and then moved to one end portion of the traverse rail 20 by the cart 22. The cylinder block W is transferred as shown in FIG. 1, and then handed over to the next process.

In addition, in order to replace each mold in this device, for example, the fixed lower mold 2 removed from the lower fixing plate 1 and the horizontal mold 4 removed from the mold mounting plate 44 are replaced with the upper mold 12. Bore type I
3 and the front and rear molds 15 and 16 to the mold exchange station P3, where they are lowered onto the mold exchange trolley 32 and removed onto the trolley 32, and then the molds that have been transported on other trolleys are transported to the mold exchange station P3. The upper mold is attached to the mold mounting frame 10, and the front and rear molds are attached to the cylinder 17.18, and the lower mold and the horizontal mold are carried together with them to the pouring station P, where the lower mold and the horizontal mold are This is done by attaching each to the lower fixing plate 1 and the horizontal cylinder 3.

Effects of the Invention As described above, according to the present invention, by positioning and supporting the cylinder lychee, water jacket core, and crankcase core positioned on a jig with the bore type and the front and rear types, each of these can be improved. By simply setting the mold at a predetermined position relative to the fixed lower mold at the pouring position, the cylinder liner and each core can be positioned with high precision relative to the fixed lower mold. Moreover, since the cylinder liner and each core are cast while being supported by the bore mold and the front and rear molds, the final positioning accuracy of the core etc. can be greatly improved compared to conventional methods. Even though the shape is extremely complex and unstable, it is possible to achieve complete automation from setting the core etc. to casting.

Additionally, due to the special feature of the cylinder block where the crankcase skirt is asymmetrical, it is necessary to use the crankcase core, which forms part of the lower mold, but this can happen if the crankcase core is used together. Interference between the jig and the crankcase core on the jig can be easily avoided by using a movable positioning member, and in addition to realizing the automatic setting of the core etc. mentioned above, damage to the core can be prevented. There are advantages that can be achieved.

[Brief explanation of drawings]

Fig. 1 is a perspective view of essential parts showing one embodiment of the casting device of the present invention, Fig. 2 is a sectional explanatory view of Fig. 1, Fig. 3 is a side view of Fig. 1, and Fig. 4 is a cylinder block diagram. Cross-sectional view, Figure 5 is the second
6 is a vertical sectional view of FIG. 5, FIG. 7 is a perspective view of the cylinder liner and water jacket core,
Figure 8 is a perspective view of the crankcase core, Figure 9 is a plan view of Figure 8, and Figures 10 (Δ), (B), and (C) are explanations of the operation of the core setting jig in Figure 2. 11, 12, 13, and 14 are operation explanatory diagrams of the main parts of FIG. 2. 1...Lower fixing plate, 2...Fixing lower mold, 4...
・Horizontal type, 7... Traveling trolley, 10... Mold mounting frame, 12... Upper die, 13... Bore type, 15... Front die, 16... Rear die, 23... - Core setting jig, 41
...Vacuum pump as suction means, 42...Suction opening, 45...Water jacket core, 46...
Crankcase core, 47, 48, 49... baseboard, 5
0,51.52... Baseboard insertion part, 54... Cylinder liner, 57... Positioning block as a positioning member, C... Crankcase, S, , S,... Skirt part, R...Product space, W...Cylinder block pl...Pouring station (pouring position), P...
...Standby station (standby position). Figure 5 Figure 12 Figure 13vA Figure 14

Claims (1)

[Claims] (1) In a cylinder block casting machine in which the lower end of one skirt part of the crankcase is curved inward to form the skirt part asymmetrically with respect to a plane containing the cylinder bore center line, the cylinder block is horizontal at the pouring position. A fixed lower mold fixed to the lower fixed plate, a pair of horizontal molds provided on the lower fixed plate and movable relative to the fixed lower mold, and a pair of horizontal molds provided at a standby position adjacent to the pouring position to hold the cylinder liner and a jig for positioning the water jacket core and the crankcase core, which corresponds to the above-mentioned curved skirt portion and constitutes a part of the lower mold, at the regular casting position; and the above-mentioned pouring position. A traveling trolley equipped with a mold mounting frame that is movable horizontally between the standby position and can be raised and lowered; a movable bore mold; a front-back mold that is attached to a mold mounting frame and is movable horizontally relative to the bore mold, and forms a product space together with the fixed lower mold, horizontal mold, and bore mold; and the front-back mold. and a baseboard insertion portion that positions and supports the water jacket core and crankcase core by fitting with the baseboard of the water jacket core and the crankcase core, and a baseboard insertion portion that is formed on the circumferential surface of the bore shape. a suction opening that is formed and connected to a pressure reducing means to suction and position and support the cylinder liner to the bore mold; and a suction opening that is provided in the jig to position and support the water jacket core and to attach the jig and the mold. A cylinder block casting device comprising: a movable positioning member that retracts in a direction to avoid interference with a crankcase core in response to relative vertical displacement with the frame.